Introduction: This article introduces the security and spam problems of today's email, and suggests the use of Web3 address to send and receive emails, which provides signing and end-to-end encryption for security. We have built MetaMail, now in beta phase. Click the link below to use it: https://metamail.ink/Email, Security and SpamsSince the invention of email in the last century, the protocol and running mechanism have not changed fundamentally: the sender submits an email to the mail...